TF and hypertensive disorder: Multivariate linear regression analysis for ESRD patients showed that serum creatinine (β = 0.279, p = 0.012) and transferrin saturation (β =  − 0.333, p = 0.003) were independent predictors of increased QTc dispersion while ejection fraction (β = 0.320, p = 0.002), hypertension (β =  − 0.319, p = 0.002), hemoglobin level (β =  − 0.345, p = 0.001), male gender (β =  − 0.274, p = 0.009) and TIBC (β =  − 0.220, p = 0.030) were independent predictors of increased P wave dispersion.